High-temperature superconductivity
Bi-, Tl- and Hg-based high-Tc superconductors

Formula
Notation
Tc (K)
No. of Cu-O planes in unit cell
Crystal structure
YBa2Cu3O7
123
92
2
Orthorhombic
Bi2Sr2CuO6
Bi-2201
20
1
Tetragonal
Bi2Sr2CaCu2O8
Bi-2212
85
2
Tetragonal
Bi2Sr2Ca2Cu3O10
Bi-2223
110
3
Tetragonal
Tl2Ba2CuO6
Tl-2201
80
1
Tetragonal
Tl2Ba2CaCu2O8
Tl-2212
108
2
Tetragonal
Tl2Ba2Ca2Cu3O10
Tl-2223
125
3
Tetragonal
TlBa2Ca3Cu4O11
Tl-1234
122
4
Tetragonal
HgBa2CuO4
Hg-1201
94
1
Tetragonal
HgBa2CaCu2O6
Hg-1212
128
2
Tetragonal
HgBa2Ca2Cu3O8
Hg-1223
134
3
Tetragonal

Question: What are the transition temperatures of the superconductors Bi-2201, Bi-2212 and Bi-2223?
Answer: The Bi-2201, Bi-2212 and Bi-2223 superconductors have transition temperatures of 20, 85 and 110 K.